Cut-off valve.



J. L. MOORE.

GUT-OFF VALVE. APPLICATION FILED FEB. 24/1905.

Patented Nov. 23, 1909.

3 SHEETS-SHEET 2.

- J. L. M00RE.

GUT-OFF VALVE.

APPLICATION FILED FEB. 24, 1905.

Patented Nov. 23, 1909.

3 SHEETS-SHEET 3.

1 7 INVENTOR: ifwm.

ATTORNEYMA WITNESSES: a I

v a citizen of the United States, and a resident pair in s pg rnnirorricn.,-f

JAMES LEONARD MOORE, OF EDGEWOOD PARK, PENNSYLVANIA, ASSIGNOB TO THEWESTINGHOUSE MACHINE COMPANY, A CORPORATION OF PENNSYLVAgTIA.

CUT-OFF VALVE.

Specification of Letters Patent. Patented Nov. 23, 1909.

. Application filed February 24, 1905 Serial No. 247,119.

To all whom it may concern:

Be 1t known that I, J AMES LEONARD Moon'n,

I of EdgewoodPark, in the county of Allegheny and State pf Pennsylvania,have invented a few and useful Improvement in Cut-Oil Valvesfof whichthe following is a specification.

"This invention relates to valves, and more particularly to automaticcut-oil? valves.

The object of this invention is the production of means, in connectionwith a throttling valve,-fo'r automatically cutting oil the supply ofmotive fluid to the said valve when the engineer machine to which it isattached exceeds some predetermined speed.

A further object of this invention is the 7 production "ofmeans forsimplifying the construction of acut-ofl? valve, and forv 1nsuring itsquick and reliableaction.

A difficulty with automatic cut-01f valves as applied to fluid pressureengines, has been in the application of a force sufficiently great tooperate the valve quickly and reliably, and, at the same time, inmaintaining a delicate adjustment inthe automatic controlling device bymeans of which the force is applied; 'It has, therefore, been my objectto construct a valve that shall act instantaneously and with sulficient"force to absolutely performits functions, and, at the same time, onethat shallbe controlled by a very slight motion or pressure in thegoverning or controlling device.

In the drawings accompanying this application, and forming a partthereof, Figure l is a section'of the automatic cut-oft" valve asapplied to a balanced globe valve; Fig. 2 is the automatic cut-01f valveshown in con nection with an ordinary globe valve and Fig. 3 illustratesa speed responsiveedevice,

shownmpartially in sectiqn, vin connection with an elevation of the egtprior-of a valve em ying my invention;

A briet description 'of the globe valve,

shown in Fig. 1 and its operation, will be necessary in describing theautomatic cutofi valveas f,

The valve casing 3 is provided with the usual diaphragm -between theinlet passage or port 5v and the outlet passage or port 6; thisdiaphragmhaving a main valve port 7, the walker rim of whichat one side.con-.

form of a hollow piston, located and movable in the cylinder10,whichform a portion of the passage 5. The cylindrical portion 9 of thevalve 8 is provided with packing rings 11 which engage with thecylindrical surface; ofthe chamber 10. The body of the valve 8 isprovided with a steam port 12 communieating with low pressure passage 6of the globe valve, which port is normally closed by means of the valve13 having a stem 14 that also serves as the stem for the valve 8, andwhich projects through a suitable stuffing box 15 with which the casingis provided.

The stem 14 is provided with suitable means, (not shown) such as ahand-wheel, for operating the valves to which it is attached.

is provided with a small port or passage 16,

which provides a communication between the inlet port or passage 5 andthe cylinder or space 10 beyond the valve 8 and its piston orcylindrical portion 9. i

The operation of the valve is as follows: The steam or other fluid underpressure will leak through the port or passage 16 until the space abovethe piston and valve is filled. Then the entire pressure'of the fluid onthe inlet side is exerted in such a direction as will tend to hold thevalve to its seat. It is obvious that if this pressure were not'relievedby some means, a very large expenditure of force would be necessary inorder to open the main valve 8, provided it were of considerable size.In order to relieve this pressure, the stem 14, in turning, first raisespassage 12. The pressure above the .valve 8 and that below is thus-madesubstantially equal, as the port 12 is sufliciently large to admit of anunrestricted flow of the steam or motive .fiuid through the cylindrical,chamber 10. The valve 8 is then substantially balanced, and may bereadily unseated by the application-of a comparatively small amount ofpower -at the hand-wheel in the further upward movement of the stem 14,

After the valve is unseated, the port 12 re-. mains open, equaliaing thepressure on both sides of thevalve 8. Inclosing the valvedj the port 12remains open until after the valve is seated, then a further motion ofthe stem let closes the port 12.

Cut-off valve 17 within the casing 3 operates 'coaxially with the mainvalve 8, and the construction of it is such, that the annular chambers18 and 19 are formed between it, the said cut-oil valve, and theexterior supplies steam or other motive fluid at initial 1 pressure tothe cylindrical chamber 18. A smaller and restricted passage 25 suppliesinitial steam to the chamber 19 by connecting it with the passage Thcannular chamber 19 is also supplied with an exhaust passage 26, which istitted with an automatically actuated valve 35. The automatic action ofthe valve in this passage 26 depends upon the speed of the engine. Thevalve normally closes the passage 20, and is so adjusted that for somepredetermined speed of the engine, it will open the passage. This valvemay be one of the many now common, and can be operated by a trippingdevice, or other familiar means, actuated by a gov er-nor or governingdevice operated by the engine.

A sleeve 27 around thestem 1 1 of the main valve is mounted firmly tothe casing 3 and carries an adjustable nut upon which is seated a spiralspring 25), surrounding the sleeve, which operates against a cylindricalportion 30 of the .cut-otl' valve in holding it.

in the position shown. Under these conditions, and with the automaticvalve inthe passage 26 closed, the chamber 18, the.

chamber 19, and the cylindrical space it) are under initial pressure,and the spring 27 having no external pressure to overcome, with theexception of the weight of the valve 17, operates against the portion2") and holds the valve 17 open.

The size of the passage 26 is such that whenlthe valve 35 is open, thesteam or other motive fluid is exhausted from the annular chamber 19through this passage 26 faster than it can be admitted through thepassage 25. For this reason the steam flowing through the annularchamber 19 exerts practically no pressure in that chamber, and since thesteam pressure in the annular chamber 18 is unchanged and the flow ofsteam to that chamber is unimpeded, the

.valve 17, because of the unbalanced steam pressure exerted on thecollar 23. will be torced to its lowest position. In this position, theedge or run 31 of the cut-oil valve The valve disk 39 operates to openor close communication between the respective chambers and therebycontrols the delivery of fluid from the chamber 19 through the pas sage2G. The disk 39 is .held closed by means ot' a trip lever to, which isheld against the valve stem ll by means of a spring 42 operating througha suitable replacing lever 43. The trip is arranged to release thevalvestem 41 and open the valve 35 when the speed of the enginereceiving fluid from the main supply valve is increased beyond somepredetermined amount. This 'is accomplished by means of the automaticcut-0E governor which is operated by the rotatable shaft of the engine.

The governor comprises centrifugal weights tet, which are arranged tomove,

under the influence of centrifugal force, to I release the stem ll bytripping the lever 40 through the agency of a pin as when the engine, towhich they are connected, exceeds a certain predetermined speed. Thevalve disk :39 is held closed against the steam pressure in the chamber38 and consequently when the stem 4l is released by the trip lever t0the disk 39 is moved by the steam pressure in the chamber 38 toestablish comnmnication between the chambers 37 and 38,

and thereby exhaust the fluid from the.

chamber 19 and permit the cutoff valve to close, as has been described.

In Fig. 2 the cut-off valve is shown applied to the ordinary globevalve; the casing 3 is supplied with the usual diaphragm 4; the valve 8,in closing the port 7, seats upon this dia hragm; the passage 5 connectswith the cylindrical portion 10 in which the automatic cut-ott' valve 17operates.

The cut-oft valve is (if such formation that with the sides of thecylinder 10 it forms the annular chambers 18 and 19. Steam at initialpressure is admitted to the chamber 18 through the port. or passage 24,and is admitted to the annular chamber 19 through i from the passage 25,and the pressure in ing the controlling device may be used.

"how of fluid through said casing, a chamber "*exposed to fluid pressurewhereby the said off valve is caused to close.

holding said cut-off valve normally open,

' controlling the delivery of motive fluidpast means for maintainingsaid valve open hand annular chamber 18 to its lowest position, the rim31 seating in the groove 32 with which the diaphragm 4 is supplied.This, as in the case of the balanced globe valve, cuts oii' the fluidsupply to the valve 8. a

After the automatically operatedvalve in the passage 26 has; been openedand the cutoff valve has operated, any suitable means for again closingthe passage and re-adjust- 1 When the passage 26 is closed, the annularchamber 19 is soon filled with initial steam this annular chamberbalances that of the annular chamber 18-, and since the spring 29 hasnow no external pressure to overcome, it again raises the cut-off valve17 to its normal position.

What I claim is:

1. The combination with avalve casing, a throttle valve operatingtherein to control the flow of fluid through said casing, a cutoff valvesurrounding said throttle valve and operating coaxially therewith to cutoif the cut-off valve is balanced, and means for exhausting said chamberwhereby the said out- 2. T he combination of a valve casing, a throttlevalve operating therein, a fluid actuated cut-oli valve surrounding saidthrottle valve and operatingcoaxially therewith, a chamber, exposed tofluid pressure, whereby said cut-off valve is balanced, a spring for andmeans for exhausting said chamber whereby said cut-off valve is closedagainst the pressure of said spring.

3. In combination in a valve casing, a manually operated throttle valve,a fluidactpatedcut-otl' valve within said casing and means forexhausting one of said chambers and thereby closing said valve inopposition to said opening means.

In combination in a valve casing, a manually operated throttle valve, .afluidactuated cut-off valve located within said casing and controllingthe delivery of motive fluid past said throttle valve, a pressure 1 aported diaphragm between the ports, a

valve. seating on said diaphragmpto close communication betweensaidports, a cut-off valve operating withinsaid casing and seated on saiddiaphragm to close communication between saidports and fluid-actuatedmeans within said casing for controlling the operation of said cut-oft'alve.

7. in combination in a valve casing prof. vided with an inlet port andan outlet port,

a ported diaphragm located between said ports, a valve, seating on saiddiaphragm,

'to close communication between said ports,

a cut-cit valve surrounding said valve and seating on said diaphragm tocontrol the delivery of fluid past said valve. and means,

' receiving motive fluid from within said casing, for actuating saidcut-off valve.

8. In combination in avalve casing,'a throttle valve, a cut-oil" valvesurrounding said throttle valve and operating co-axially with andindependently of the throttle valve fluid-actuated means within'saidcasin operation of said cut-o and for controlling the valve.

' 9. In combination in a valve casing, a

throttle valve operating therein, a cut-off valvesurroundingsaidthrottle valve and operating cc-axially with and independently ofthe throttle valve, and fluid-actuated means receiving fluid from Withinsaid casing for controlling the operation of said outofl .va'lve.

10.-In combination in a'valve casing,-a throttle valve operatingtherein, a cut-off valve surrounding said throttle valve and operatinginde endently thereof, means for yieldingly hol ing said cut-off valveopen and fluid-actuated means, located within said casing and receivingmotive fluid therefrom, for closing said cut-off valve in opposition tosaid yielding means.

ILA fluid=pressure engine, a fluid-supply valve therefor comprising avalve casing provided with inlet and outlet ports, a

valve operating Within said casing. to control the communication betweensaid ports, in combination with a cut-off valve located within saidcasing and operating to close communication with said ports,fluid-actuated means within said casing controlling the operationof saidcutoff valve and means, dependent on the speed of said engine, forcontrolling the operation of said fluid-actuated means.

12. A valve casing provided with an inlet and anoutlbt port, a valveoperating therein to control the passage of motive fluid through saidports, in combination with a cut-oil valve located Within said casingand controlling the delivery of motive fluid through said ports,fluid-actuating'means for said'cut-ofi' valve receiving motive fluidfrom said casing and an automatically actuated valve for controlling theoperation of said actuating means.

13, In combination in a valve casing, a throttle valve having a stemprojecting through the easing a rigid sleeve around the stein a cut-otfvalve concentric with the stern and the throttle valve, a spring bearingagainst a part on the sleeve and normally supporting the eut-ofi' valve,means within the casing for exerting opposed pressures on opposite sidesof the cut-oft valve and means for exhausting pressure from one side ofthe cutoff valve.

! T4. In combination, a valve casing, a i throttle valve in said valveeasing, a cut-off \'ztl\0 eoneentrie with the throttle valve, a springnormally holding the cut-off valve unseated, means withinthe valvecasing for exerting opposin pressures on opposite sides of the out-0%valve and'means Within the casing for exhausting pressure from the sideof the cut-oil" valve opposed to the spring.

In testimony whereof, I have hereunto Vitnesses: y

W. S. THOMPSON, Dwm lVILLIAMs.

subscribed myname this-25th day of J anu-

